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Title: A collusion-resistant conditional access system for flexible-pay-per-channel pay-tv broadcasting
Authors: Wan, Z.
Liu, J.
Zhang, R.
Deng, R.H. 
Keywords: Access Control
Cable TV
Communication System Security
Issue Date: 2013
Citation: Wan, Z., Liu, J., Zhang, R., Deng, R.H. (2013). A collusion-resistant conditional access system for flexible-pay-per-channel pay-tv broadcasting. IEEE Transactions on Multimedia 15 (6) : 1353-1364. ScholarBank@NUS Repository.
Abstract: Pay-TV broadcasting system is an extensively deployed application that charges users based on their subscription. To ensure security for the Pay-TV broadcasting application, a conditional access system (CAS) is designed to control TV channel/program access to only the authorized subscribers. Several key management schemes with a four-level hierarchical key structure have been proposed. In this paper, we point out a severe security weakness of these schemes against collusion attacks. Then we propose a new CAS scheme with a three-level hierarchical key structure using ciphertext-policy attribute-set-based encryption (ASBE), an extension of ciphertext-policy attribute-based encryption (CP-ABE). Our scheme achieves scalable, flexible, fine-grained, and most importantly, collusion-resistant access control for Pay-TV broadcasting applications. The proposed scheme is designed to support all operations in Pay-TV applications. We then provide a detailed analysis on security and performance of our scheme. We also implement the scheme and it is showed to be both efficient and flexible for Pay-TV broadcasting applications. © 2013 IEEE.
Source Title: IEEE Transactions on Multimedia
ISSN: 15209210
DOI: 10.1109/TMM.2013.2250493
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